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Thread: Sample size for a set of correlations averaged into pearsons r

  1. #1
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    Sample size for a set of correlations averaged into pearsons r

    Hi all

    I am conducting a meta analysis of pearson r correlations. I have converted these into fishers z to analyse in SPSS. Some studies presented more than one correlation , but measuring the same construct with the same method. I have averaged these correlations via fishers z but I now have a problem in that I need to calculate a standard error and the deviance which , I believe , requires one sample size per correlation.
    I am wondering if it is acceptable to calculate an average of the sample size by combining the samples and dividing by the number of samples please?
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  2. #2
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    Re: Sample size for a set of correlations averaged into pearsons r

    Hey laboh.

    Hint - Consider using central limit theorem and the observables you use for data are correlation estimates - not normal observables. [i.e. xi = correlation_i].

    This is if you have lots of estimates and we assume IID.
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  3. #3
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    Re: Sample size for a set of correlations averaged into pearsons r

    Hi Chiro

    Thanks. There are 29 correlation estimates in total ( when all are averaged - i.e 29 studies with one correlation). There are two studies with two separate correlations and sample sizes , there is one study with three separate correlations and sample sizes.
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